TDA1315H/N2 データシートの表示（PDF） - Philips Electronics

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TDA1315H/N2

Digital audio input/output circuit(DAIO)

Philips Electronics 

Philips Semiconductors

Digital audio input/output circuit (DAIO)

Product specification

TDA1315H

FUNCTIONAL DESCRIPTION

Modes of operation

With respect to the control of the device and the exchange

of non-audio data, a microcontroller (host) mode and a

stand-alone mode can be considered. The selection of the

mode is performed at pin CTRLMODE.

In the stand-alone mode, the device configuration is solely

determined by pins. In the host mode an internal control

register, or pins or both can be used to change the default

settings.

With respect to the direction of the digital audio data, the

device can be operated in either a transmit or a receive

mode under control of a microcontroller. In the stand-alone

mode the device is only a receiver. In the receive mode the

input signal can also be made available at the output pin

IECO (feed-through) to ease the cascading of digital audio

equipment.

The device can be brought to standby mode at all times by

activating the PD pin (power down). In this mode all

functions are disabled, all outputs 3-stated, supply current

is minimized and the contents of the register are saved.

General

For those applications where it is important to save power,

the PD pin is provided, which, when activated, puts the

TDA1315H in standby mode by disabling all functions and

3-stating all outputs, while saving register contents.

As illustrated in Fig.1, the TDA1315H contains the

following major functional blocks:

• IEC input section

• Biphase demodulator

• Frame and error detection

• Clock and timing section

• IEC output section

• Biphase modulator

• Audio section (I2S-bus transceiver)

• Non-audio section (control and FIFO)

• User (microcontroller) interface.

IEC INPUT SECTION

There are two biphase signal inputs to the IEC input

section. IECIN0 accepts TTL levels from, for example, an

optical input device, while IECIN1 is designed for coaxial

cable inputs and requires signal levels of minimum

200 mV (p-p) via an external coupling capacitor. The

selection of the active input channel is performed by pin

IECSEL or by the control register or both. In the receive

mode, the selected input signal is applied internally to the

biphase audio output section to enable a feed-through

function.

BIPHASE DEMODULATOR

In the biphase demodulator, the received signal (for details

see Chapter “References”[1] and [2]) is converted to

binary data and separated into audio and non-audio data

for further processing in their dedicated sections. The

demodulated input signal is also required for frame and

error detection.

FRAME AND ERROR DETECTION

In the frame and error detection block, the framing

information from the received biphase signal is retrieved to

synchronize the biphase demodulator and to allow access

to the audio and non-audio data bits. An out-of-lock

condition of the PLL is flagged at UNLOCK. The validity of

audio samples is indicated at pin INVALID.

CLOCK AND TIMING SECTION

In the clock and timing section, the timing information

inherent to the received biphase signal is retrieved and a

symmetrical master clock signal is generated and output at

pin SYSCLKO. Depending on the mode of operation, the

frequency of this master clock can be selected by pin

CLKSEL, by the control register or both to be either 256fs

or 384fs (fs = audio sampling frequency). This section

contains all the circuitry of a Phase-Locked Loop (PLL),

except for the loop filter components, which are connected

externally to pins RCint and RCfil. When the input signal is

interrupted, the oscillator will slowly drift to the

centre frequency in order to keep the system operating on

a proper frequency. In the transmit mode, all required

timing signals are input at pin SYSCLKI and are derived

from an externally supplied system clock of either 256fs or

384fs. The input HIGH time of that clock may be in the

range between 30% to 70% of the clock period.

IEC OUTPUT SECTION

In the IEC output section, either the received (feed-through

function) or the generated biphase signal is selected for

output at pin IECO, depending on the receive/transmit

mode. The output can be enabled/disabled by pin

IECOEN, by the control register or both, and can drive a

suitable optocoupler and a transformer in parallel.

1995 Jul 17

7

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